| 双齿甜菜碱衍生物大环及双环镉(Ⅱ)配位化合物的合成与晶体结构(英文) |
| Synthesis and Crystal Structures of Cadmium(Ⅱ) Coordination Compounds of Large Ring and Bicyclo Framework with a Bidentate Betaine Derivative |
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| 摘要: 利用甜菜碱衍生物1，5-二(4-羧基吡啶基)-N-甲基二乙胺(L)合成了两种镉(Ⅱ)的配位化合物[Cd2Cl4(H2O)2L2]·2H2O和[Cd2(SCN)4( μ-H2O)L2]。用X-射线单晶衍射仪测定了配合物的单晶结构，并对它们进行了元素分析、红外光谱、1H NMR、热重等表征。结构分析表明，前者具有三十六元大环框架，而后者为双环结构。由于缺乏分子之间的强烈相互作用，弱相互作用决定了这两种化合物在晶格中的堆积模式：前者由相邻分子间的π-π和C-H…π相互作用而堆积形成二维砖墙的结构；后者由配位的SCN-阴离子通过S…S弱相互作用联接成一维链状结构。 |
| 关键词: 双齿甜菜碱衍生物 镉(Ⅱ)配合物 π-π堆积 C-H…π作用 S…S作用 |
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| Abstract: A new bidentate betaine derivative 1,5-bis(4-carboxypyridinium)-N-methyl-diethylamine (L) was prepared and allowed to react with cadmium salts leading to the formation of two new cadmium coordination compounds [Cd2Cl4(H2O)2L2]·2H2O and [Cd2(SCN)4( μ-H2O)L2], which were structurally characterized by IR spectoroscopy, single-crystal X-ray diffraction, elemental analysis, thermal analysis, etc. The single crystal X-ray diffraction structure analysis of these compounds shows the molecule of former consists of discrete 36-membered ring and that of latter bicyclo[17.17.1] structure. Owing to lacking strong intermolecular interactions in these compounds, weak interactions determine their packing pattern in crystalline state: the former forms 2D brick-wall network by the π-π stacking and C-H…π interactions between pyridyl rings of adjacent molecules, and the latter zig-zag chains through S…S weak interactions between ligating SCN- anions. CCDC: 860582, 1; 860583, 2. |
| Keywords: bidentate betaine derivative cadmium(Ⅱ) coordination compounds π-π stacking C-H…π interaction S…S weak interaction |
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| 辛清萍,李松林,刘雪佳.双齿甜菜碱衍生物大环及双环镉(Ⅱ)配位化合物的合成与晶体结构(英文)[J].无机化学学报,2012,28(4):815-822. |
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